US5913438A - One piece self-standing blow molded plastic containers made from a monobase preform - Google Patents
One piece self-standing blow molded plastic containers made from a monobase preform Download PDFInfo
- Publication number
- US5913438A US5913438A US08/556,809 US55680995A US5913438A US 5913438 A US5913438 A US 5913438A US 55680995 A US55680995 A US 55680995A US 5913438 A US5913438 A US 5913438A
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- United States
- Prior art keywords
- base
- container
- wall thickness
- sidewall
- forming portion
- Prior art date
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
- B65D1/0223—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by shape
- B65D1/0261—Bottom construction
- B65D1/0284—Bottom construction having a discontinuous contact surface, e.g. discrete feet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/071—Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
- B29C2949/0722—Preforms or parisons characterised by their configuration having variable wall thickness at neck portion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
- B29C2949/0725—Preforms or parisons characterised by their configuration having variable wall thickness at bottom portion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/073—Preforms or parisons characterised by their configuration having variable diameter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/073—Preforms or parisons characterised by their configuration having variable diameter
- B29C2949/0731—Preforms or parisons characterised by their configuration having variable diameter at neck portion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/075—Preforms or parisons characterised by their configuration having at least one internal separating wall
- B29C2949/0754—Preforms or parisons characterised by their configuration having at least one internal separating wall at bottom portion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
- B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
- B29C2949/0769—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the lip, i.e. very top of preform neck
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
- B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
- B29C2949/077—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the neck
- B29C2949/0772—Closure retaining means
- B29C2949/0773—Threads
- B29C2949/0774—Interrupted threads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
- B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
- B29C2949/077—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the neck
- B29C2949/0777—Tamper-evident band retaining ring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
- B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
- B29C2949/078—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the bottom
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/081—Specified dimensions, e.g. values or ranges
- B29C2949/0811—Wall thickness
- B29C2949/0817—Wall thickness of the body
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/081—Specified dimensions, e.g. values or ranges
- B29C2949/0811—Wall thickness
- B29C2949/0818—Wall thickness of the bottom
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/081—Specified dimensions, e.g. values or ranges
- B29C2949/082—Diameter
- B29C2949/0826—Diameter of the body
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/081—Specified dimensions, e.g. values or ranges
- B29C2949/082—Diameter
- B29C2949/0827—Diameter of the bottom
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/0861—Other specified values, e.g. values or ranges
- B29C2949/0872—Weight
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
- B29C2949/22—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at neck portion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
- B29C2949/24—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at flange portion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
- B29C2949/26—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at body portion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
- B29C2949/28—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at bottom portion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/30—Preforms or parisons made of several components
- B29C2949/3024—Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/06—Injection blow-moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/08—Biaxial stretching during blow-moulding
- B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
- B29C49/12—Stretching rods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/08—Biaxial stretching during blow-moulding
- B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
- B29C49/12—Stretching rods
- B29C49/121—Stretching rod configuration, e.g. geometry; Stretching rod material
- B29C49/1215—Geometry of the stretching rod, e.g. specific stretching rod end shape
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
- Y10T428/1397—Single layer [continuous layer]
Definitions
- the present invention relates to plastic containers for containing fluids under pressure and the methods of producing same and, more particularly, to a one-piece disposable plastic bottle of the petaloid base variety having a reinforcing ring and a stretched gate area.
- the monobase preform has a reinforcing ring forming portion.
- the reinforcing ring forming portion is thicker than at least the sidewall forming portion and also, usually, the gate area forming portion.
- the reinforcing ring extends circumferentially around the base.
- the first plastic bottles were generally two piece bottles comprising a pressure vessel portion and base which permitted the bottle to stand upright on shelves, and the like.
- the pressure vessel portion was typically of a tough, flexible plastic (e.g. polyester) which became resiliently rigid for gripping due to the internal pressure created by the carbon dioxide gas in the soft drink liquid contained therein.
- the bottom was hemispherical and the separate base was required in order for the bottle be able to stand by itself.
- the base was typically of a plastic such as polyethylene and is attached over the bottom of the pressure vessel portion with adhesive.
- a blow molding process for producing a self-standing one-piece polyester container for carbonated beverages defining a longitudinal axis and comprising a sidewall portion which is integral with and terminates in a closed base of a petaloid form defining at least three feet disposed about the longitudinal axis whereby the container is self standing, each said foot being defined by a support pad and sloping walls extending therefrom to radially extending straps disposed between adjacent pairs of feet, each said strap extending from a gate area, centered on said longitudinal axis, along a curve toward an extended portion adjacent said side wall; and, a reinforcing ring located on said curve between said gate area and said extended portion and extending around said base through said feet, adjacent sloping walls and said straps, the method comprising the steps of a) forming a hollow preform comprising a sidewall forming portion of constant wail thickness material along the length thereof for forming a constant thickness sidewall portion of the container and terminating, at a transition,
- a self-standing polyester container for carbonated beverages defining a longitudinal axis and comprising a sidewall portion which is integral with and terminates in a closed base of a petaloid form defining at least three feet disposed about the longitudinal axis whereby the container is self standing, each said foot being defined by a support pad and sloping walls extending therefrom, said feet being disposed about said longitudinal axis, said base having radially extending straps disposed between adjacent pairs of feet, each said strap extending from a gate area, centered on said longitudinal axis, along a curve toward an extended portion adjacent said side wall; and, a reinforcing ring located on said curve between said gate and said extended portion and extending circumferentially around said base through said feet, adjacent sloping walls and said straps.
- FIG. 1 is a partially sectioned view taken along line 1--1 of FIG. 2 of a prior art bottle having a petaloid base;
- FIG. 2 is a bottom view of the petaloid base of a prior art bottle
- FIG. 3 is a section view of the base of the container of the present invention.
- FIG. 4 is a section view of the base of the container of FIG. 3 showing an alternative embodiment of the present invention.
- FIG. 5 is a bottom view of the present invention.
- the base of the preferred form of the container of the present invention comprises a petaloid design for a bottle which has a plurality of at least three (preferably five) feet evenly disposed around the longitudinal axis of the bottle and projecting from a hemispherical base form of the bottle to provide a stable self-standing support for the bottle.
- a radially extending valley Between each adjacent pair of feet is a radially extending valley, the valley floor of which is preferably curved in cross-section.
- the valley floor generally follows the hemispherical base shape and opens to an extended portion of that base shape lying radially outwardly of the feet.
- a prior art one piece self-standing bi-axially oriented PET two liter bottle 1 of circular horizontal cross-section, comprises a neck finish 2 connected to a neck transition portion 3 by way of a neck support ring 4.
- the neck transition portion 3 connects by way of an upper portion 5 of the bottle to a substantially cylindrical sidewall portion 6 which terminates at its lower end in a closed base 7, the underlying shape of which is hemispherical.
- the bottle 1 defines a longitudinal axis 8.
- each foot 9 comprises sloping walls 11 extending from its pad 10 to its junction with the underlying hemispherical formation (reference numbers for sloping walls 11 are included in FIG. 2 only with respect to one of the feet although all of the feet are identical).
- valleys (or straps) 12 are disposed between adjacent pairs of feet 9. These straps 12 each include a valley floor which substantially follows the surface curvature of the underlying hemispherical shape of the base 7 and terminates at and open into an extended portion 13 where the straps 12 meets the sloping wall 11. Although shown in FIG. 2 by solid lines for simplicity at the junctions between the sloping walls 11 and the straps 12 and pads 10, the intersection of these elements are curved in cross-section to provide smooth transitions and structural rigidity of the straps along their length.
- the gate area 14 of the base 7, through which extends the axis 8 is connected to each pad 10 by a substantially flat ridge path 15 joined on either side to portions of the sloping walls 11.
- the bottle illustrated includes a small annular lip 16 which is primarily present for aesthetic purposes and for label alignment during production. This lip lies adjacent the transition from the sidewall 6 to the base 7.
- the transition from the extended portion 13 to the gate 14 is a smooth transition with increasing cross-sectional thickness. That is, the thickness at "D1" is less than the thickness at "A" which are both greater in thickness than the base of the present invention as will be discussed hereinafter.
- FIGS. 1, 3 and 4 it will be noted that although the bottle is illustrated in cross-sectional form and although the material of the bottle will usually be substantially transparent, details of the interior of the bottle, lying beyond a cross-section taken are omitted for the sake of clarity in the illustration of the invention.
- FIG. 3 shows the petaloid base of the present invention.
- the preform 18 injection molded polyester, typically PET (polyethylene terephthalate), is temperature conditioned and placed in a blow mold over and longitudinally stretched by a stretch rod 19. Pressurized gas is applied within the annular space 20 between the preform 18 and stretch rod 19 to push the walls of the preform 18 outwardly away 25 from the axis 8 so as to expand the preform 18 into a desired finished shape in the blow mold which defines the exterior of that shape.
- PET polyethylene terephthalate
- the preform comprises a neck finish 2, connected to a neck transition portion 3 by way of a neck support ring 4.
- a sidewall producing portion 22 of the preform extends from the neck transition portion 3 with a substantially constant outside diameter of 1.125 inches, however, both the inner 32 and outer 33 walls of the sidewall forming portion 22 are slightly tapered to facilitate release from the injection mold cavity and core.
- the thickness of the sidewall forming portion is about 0.145 inches.
- the sidewall forming portion 22 terminates in a closed base producing portion 23 having a wall thickness, in the gate producing area thereof, of 0.110 inches.
- the resulting preform 18 is similar in shape to a test tube.
- the transition (reinforcing ring forming portion 24) between the sidewall forming portion 22 and the bottom forming portion 23 has an increased wall thickness of about 0.160 inches.
- the purpose of the reinforcing ring forming portion 24 will be described hereinafter.
- the preform 18 Prior to blow molding the preform 18 to produce the bottle 1, the preform 18 is temperature conditioned with preform 18 being turned about axis 8, during conditioning, so as to receive uniform heat. This temperature conditioning takes place outside the blow mold cavity immediately prior to being positioned in the mold cavity. For simplicity, the neck producing portion (which remains substantially the same) and the mold itself are not shown.
- the stretch rod 19, being extendable along the longitudinal axis, is pushed downward stretching the preform longitudinally until the bottom 29 of the preform 18 is closely adjacent (but spaced from) the bottom of the cavity.
- the reinforcing ring forming portion 24 has a wall thickness greater than both the wall thickness of the sidewall forming portion 22 and the bottom forming portion 23 and therefor the reinforcing ring forming portion 24 has a greater mass per unit area and is slightly cooler than the thinner portions of the preform. Due to this and the greater thickness more stretching occurs in the sidewall forming portion 22 and the gate area forming portion 23 than in the relatively cool thicker reinforcing ring forming portion 24.
- the stretch ratio between the wall thickness of the gate area forming portion 23 and the gate area 14 is about 2:1 whereas the stretch ratio between the sidewall forming portion 22 and the sloping wall 11 is about 12:1.
- the extension of the sidewall forming portion 22 by the stretch rod 19 occurs along axis 8 as shown by arrows 35 whereas arrows 36 show the direction of extension in the bottom forming portion 23 by the stretch rod.
- the inside diameter of the preform 18 is greater than the outside diameter of the stretch rod 19 whereby an annular space 20 is provided.
- This space 20 facilitates pressurization of the preform 18 to produce the bottle 1. Also, this space provides for a simply designed stretch rod having no step to accommodate the reinforcing ring forming portion 24 of the preform 18.
- Pressurized gas is then introduced within the preform 18 to blow the preform 18 outwardly and downwardly away from the stretch rod to produce the bottle 1.
- the gas is introduced through the neck so that blow molding proceeds from the top of the bottle 1 adjacent the neck transition to the bottom forming portion 23.
- the introduction of the gas may commence before the stretch rod has completed the longitudinal extension of the preform.
- preferred performance is obtained in PET containers by providing desired axial and hoop stretching of the material during the blow molding process thus biaxially orienting the material of the container.
- the above-described control of the temperature conditioning and the stretch rod operation coupled with the blow molding itself provide desired biaxial orientation of the container material together with accurate placement of the reinforcing ring forming portion 24 and gate area forming portion 23 to form the reinforcing petaloid base of the container.
- the reinforcing ring forming portion 24 is cooler, material is pulled from bottom forming portion during blowing to increase the stretch and thus the orientation in the gate area 14. This is believed at least in part because as the sidewall forming portion 22 is blown outwardly away from the stretch rod 19, the gate area forming portion 23 is also blown outwardly and downwardly away from the stretch rod 19 while the slightly cooler more massive reinforcing ring forming portion 24 expands at a slower rate such that the reinforcing ring forming portion 24 is laid in the mold last, after the gate area has been formed.
- the gate area forming portion 23 is able to expand across the gate area with greater freedom than is available in the absence of the reinforcing ring forming portion 24.
- container in the form of a bottle is produced having less weight than prior art petaloid based bottles while maintaining adequate strength to withstand internal pressure from a carbonated beverage.
- the base of the bottle comprises all of the features of the prior art bottles to facilitate standing.
- the base contains the reinforcing ring 21, which defines the transition between an upper strap 38 and lower strap 39 of strap 12 as well as defines the transition between the sloping walls 11 and feet 9.
- the preferred preform design for a typical 2 liter bottle is one having the following:
- bottom forming portion 23 wall thickness Y
- Y from 0.6X to Z with a preferred range 0.7X to 0.8X
- Z from 1.03X to 1.33X with a preferred range from 1.05X to 1.10X
- Prior art preforms blown into large or small contact diameters petaloid bases of 2 liter bottles generally have an outside diameter of the sidewall forming portion 22 of 1.125 inches.
- wall thicknesses of the preform in this portion and at the transition to the base forming portion are:
- a thickened section 21 of material at the point needed in the bottle base, i.e. the foot is provided by the annular reinforcing ring forming portion 24 which is 0.160 inches thick.
- the wall reduction in the foot via hoop orientation only is determined by dividing the wall thickness by the stretch ratio which yields;
- the bottle base of the present invention yields the thickest foot wall which gives more reinforcement at the foot as well as minimizing stress whitening which is an aesthetic defect.
- the stress whitening is caused by overstretching the material and is common to large contact diameter bottles.
- the purpose of the reinforcing ring forming portion 24 which forms the reinforcing ring blown into the bottle base provides several benefits.
- a one piece bottle needs to be self-standing and withstand the pressure from carbonation (which rises as the bottle is exposed temperatures above room temperature).
- the base will deform unacceptably if reinforcement is not provided in lace of simply using more material.
- Strength is provided from three aspects; 1) geometric reinforcement of the base design, 2) material strength of the PET, 3) orientation strength imparted to the PET.
- the preform used in the present invention has a thickened annular ring 24 to form a reinforcing ring 21 placed into those sections of the base which need reinforcement to permit a weight reduction the container base. Further, orientation of the bottom forming portion of the preform is increased to impart orientation strength in the gate area 14 of the bottle. This area is susceptible to stress cracking the risk of which can be reduced by increasing orientation.
- the resulting base of the bottle of the present invention weighs 13.5 grams which is 1.5 grams less than the weight of the small contact diameter base (15 grams) while having a larger contact diameter (3.0 inches vs. 2.8 inches).
- the weight of the large contact diameter base is 17.5 grams.
- Table 1 shows the comparison of bottle size, weight and wall thicknesses of prior art small contact diameter and large contact diameter bottles with the bottle of the present invention.
- the bottle of the present invention there are a number of significant advantages of the bottle of the present invention to prior art small contact diameter bottles.
- the first and most important is the reduction in weight of the base (from 15 grams to 13.5 grams) while having a larger base diameter (from 2.8 inches to 3.0 inches).
- more material is provided in the foot 9 at "B” (from 0.008 to 0.14 inches thick) so that there exists less potential for stress whitening, thereby providing a more aesthetically pleasing bottle. This added material also provides a stronger foot.
- the gate area 14 at "A” is thinner (from 0.087 inches to 0.060 inches) while maintaining adequate strength. As previously discussed, the thickness at "A” can be reduced because greater stretching occurs in bottom forming portion 23 to increase orientation thereby increasing strength coupled with lighter weight.
- the overall reduction in weight of the base from a prior art large contact diameter base (17.5 grams to 13.5 grams) while maintaining more than 93% of the contact diameter (3.0/3.2) is accomplished by placing the reinforcing ring 21 in areas of the base to provide the most resistance to deformation, i.e. the strap 12 and feet 9, while reducing material thickness and increasing orientation in the gate area 14.
- the gate area forming portion could be as thick as the reinforcing ring forming portion.
- a monobase preform 18' having an annular nub 26 is engaged by a mating annular groove 27 in the end of the stretch rod 19'.
- This preform is of the type disclosed in the inventor's own patents (U.S. Pat. Nos. 4,780,257; 4,889,752; and 4,927,679), which may be used in the present invention to provide a bottle with a petaloid base rather than a champagne base to which those patents relate.
- the resulting bottle will contain the reinforcing ring 21, produced by the reinforcing ring forming portion 24' and bottom forming portion 23' of the preform 18'.
- FIG. 5 there is shown the bottom view of the base of the present invention showing the reinforcing ring 21 extending circumferentially around the base and following the curves and slopes through the straps 12 and sloping walls 11.
Abstract
Description
______________________________________ typical small contact dia .145/2.86 = .051 typical large contact dia .165/3.33 = 0.50 bottle bases of the present invention .160/3.11 = .052 ______________________________________
TABLE 1 ______________________________________ Base Thickness (in) Weight Bottle R (in) A B C D1 D2 (gm) ______________________________________ 1 1.4 .087 .012 .011 .051 .015 15 2 1.4 .077 .010 .011 .035 .011 13.5 3 1.5 .060 .014 .012 .035 .013 13.5 4 1.6 .086 .009 .013 .043 .014 17.5 ______________________________________Bottle 1 Small diameter prior art base (15 grams) 2 Small diameter prior art base (13.5 grams) 3 Present invention monofoot base (13.5 grams) 4 Large diameter prior art base (17.5 grams)
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/556,809 US5913438A (en) | 1995-01-30 | 1995-11-02 | One piece self-standing blow molded plastic containers made from a monobase preform |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/380,647 US5614148A (en) | 1995-01-30 | 1995-01-30 | One piece self-standing blow molded plastic containers made from a monobase preform |
US08/556,809 US5913438A (en) | 1995-01-30 | 1995-11-02 | One piece self-standing blow molded plastic containers made from a monobase preform |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/380,647 Division US5614148A (en) | 1995-01-30 | 1995-01-30 | One piece self-standing blow molded plastic containers made from a monobase preform |
Publications (1)
Publication Number | Publication Date |
---|---|
US5913438A true US5913438A (en) | 1999-06-22 |
Family
ID=23501973
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/380,647 Expired - Lifetime US5614148A (en) | 1995-01-30 | 1995-01-30 | One piece self-standing blow molded plastic containers made from a monobase preform |
US08/556,809 Expired - Fee Related US5913438A (en) | 1995-01-30 | 1995-11-02 | One piece self-standing blow molded plastic containers made from a monobase preform |
US08/599,515 Expired - Fee Related US5714111A (en) | 1995-01-30 | 1996-01-26 | One piece self-standing blow molded plastic containers made from a monobase preform |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/380,647 Expired - Lifetime US5614148A (en) | 1995-01-30 | 1995-01-30 | One piece self-standing blow molded plastic containers made from a monobase preform |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/599,515 Expired - Fee Related US5714111A (en) | 1995-01-30 | 1996-01-26 | One piece self-standing blow molded plastic containers made from a monobase preform |
Country Status (7)
Country | Link |
---|---|
US (3) | US5614148A (en) |
EP (1) | EP0808241A4 (en) |
AU (1) | AU696715B2 (en) |
BR (1) | BR9606858A (en) |
CA (1) | CA2210918A1 (en) |
MX (1) | MX9705621A (en) |
WO (1) | WO1996024482A1 (en) |
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US6698160B2 (en) | 2002-02-19 | 2004-03-02 | Fci, Inc. | Apparatus and method to prevent bottle rotation |
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US20120112390A1 (en) * | 2010-11-10 | 2012-05-10 | Donald Wayne Miller | Stretch rod for a two-stage blow molding machine |
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US10889411B2 (en) | 2017-02-03 | 2021-01-12 | Berry Plastics Corporation | Container with lid and detachable lid collar |
US11717990B2 (en) | 2015-10-08 | 2023-08-08 | Alpla Werke Alwin Lehner Gmbh & Co. Kg | Preform for production of a plastic container in a stretch-blow-molding method |
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US10022894B2 (en) * | 2015-03-05 | 2018-07-17 | Amcor Group Gmbh | Preform design for lightweight container |
WO2017075403A1 (en) * | 2015-10-29 | 2017-05-04 | The Coca-Cola Company | Photoelastic characterization of residual stresses and stress distributions in injection molded performs and stretch blow-molded bottles |
US10011065B2 (en) * | 2016-03-03 | 2018-07-03 | Amcor Group Gmbh | Preform design for lightweight container |
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Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6834478B2 (en) | 2002-02-19 | 2004-12-28 | Fci, Inc. | Apparatus and method to prevent bottle rotation |
US20040069736A1 (en) * | 2002-02-19 | 2004-04-15 | Fci, Inc., A Corporation Of Ohio | Plastic water bottle |
US6698160B2 (en) | 2002-02-19 | 2004-03-02 | Fci, Inc. | Apparatus and method to prevent bottle rotation |
US7681749B2 (en) | 2003-05-28 | 2010-03-23 | Fci, Inc. | Plastic water bottle and apparatus and method to convey the bottle and prevent bottle rotation |
US7028857B2 (en) | 2003-05-28 | 2006-04-18 | Fci, Inc. | Plastic water bottle and apparatus and method to convey the bottle and prevent bottle rotation |
US20040238475A1 (en) * | 2003-05-28 | 2004-12-02 | Fci, Inc., An Ohio Corporation | Plastic water bottle and apparatus and method to convey the bottle and prevent bottle rotation |
US20060051541A1 (en) * | 2004-09-09 | 2006-03-09 | Steele Scott W | Polymeric preform for a blow molded plastic article |
EP1954624B1 (en) | 2005-11-29 | 2016-06-15 | Petainer Lidköping AB | System and method for distribution and dispensing of beverages |
US9725293B2 (en) | 2005-11-29 | 2017-08-08 | Petainer Lidkoping Ab | System and method for distribution and dispensing of beverages |
US20120112390A1 (en) * | 2010-11-10 | 2012-05-10 | Donald Wayne Miller | Stretch rod for a two-stage blow molding machine |
WO2015084324A1 (en) * | 2013-12-03 | 2015-06-11 | Amcor Limited | Footed container base |
US10189597B2 (en) | 2013-12-03 | 2019-01-29 | Amcor Rigid Plastics Usa, Llc | Footed container base |
US11717990B2 (en) | 2015-10-08 | 2023-08-08 | Alpla Werke Alwin Lehner Gmbh & Co. Kg | Preform for production of a plastic container in a stretch-blow-molding method |
US10889411B2 (en) | 2017-02-03 | 2021-01-12 | Berry Plastics Corporation | Container with lid and detachable lid collar |
US11273959B2 (en) * | 2017-02-03 | 2022-03-15 | Berry Plastics Corporation | Container with lid and detachable lid collar |
Also Published As
Publication number | Publication date |
---|---|
BR9606858A (en) | 1997-11-25 |
AU5019096A (en) | 1996-08-27 |
WO1996024482A1 (en) | 1996-08-15 |
US5714111A (en) | 1998-02-03 |
AU696715B2 (en) | 1998-09-17 |
CA2210918A1 (en) | 1996-08-15 |
MX9705621A (en) | 1998-02-28 |
EP0808241A1 (en) | 1997-11-26 |
EP0808241A4 (en) | 1998-05-20 |
US5614148A (en) | 1997-03-25 |
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